{"_id":"5a3c0be32e2f55003c5eea60","project":"55faeacad0e22017005b8265","version":{"_id":"55faeacad0e22017005b8268","project":"55faeacad0e22017005b8265","__v":36,"createdAt":"2015-09-17T16:31:06.800Z","releaseDate":"2015-09-17T16:31:06.800Z","categories":["55faeacbd0e22017005b8269","55faf550764f50210095078e","55faf5b5626c341700fd9e96","55faf8a7825d5f19001fa386","560052f91503430d007cc88f","560054f73aa0520d00da0b1a","56005aaf6932a00d00ba7c62","56005c273aa0520d00da0b3f","5601ae7681a9670d006d164d","5601ae926811d00d00ceb487","5601aeb064866b1900f4768d","5601aee850ee460d0002224c","5601afa02499c119000faf19","5601afd381a9670d006d1652","561d4c78281aec0d00eb27b6","561d588d8ca8b90d00210219","563a5f934cc3621900ac278c","5665c5763889610d0008a29e","566710a36819320d000c2e93","56ddf6df8a5ae10e008e3926","56e1c96b2506700e00de6e83","56e1ccc4e416450e00b9e48c","56e1ccdfe63f910e00e59870","56e1cd10bc46be0e002af26a","56e1cd21e416450e00b9e48e","56e3139a51857d0e008e77be","573b4f62ef164e2900a2b881","57c9d1335fd8ca0e006308ed","57e2bd9d1e7b7220000d7fa5","57f2b992ac30911900c7c2b6","58adb5c275df0f1b001ed59b","58c81b5c6dc7140f003c3c46","595412446ed4d9001b3e7b37","59e76ce41938310028037295","5a009de510890d001c2aabfe","5a96f89c89442e002041144b"],"is_deprecated":false,"is_hidden":false,"is_beta":false,"is_stable":true,"codename":"v1","version_clean":"1.0.0","version":"1"},"category":{"_id":"573b4f62ef164e2900a2b881","__v":0,"project":"55faeacad0e22017005b8265","version":"55faeacad0e22017005b8268","sync":{"url":"","isSync":false},"reference":false,"createdAt":"2016-05-17T17:05:38.443Z","from_sync":false,"order":8,"slug":"algorithm-guide","title":"Algorithms"},"user":"55fae9d4825d5f19001fa379","__v":0,"parentDoc":null,"updates":[],"next":{"pages":[],"description":""},"createdAt":"2017-12-21T19:30:43.954Z","link_external":false,"link_url":"","githubsync":"","sync_unique":"","hidden":false,"api":{"results":{"codes":[]},"settings":"","auth":"required","params":[],"url":""},"isReference":false,"order":149,"body":"### Inputs\nThe following table lists all ENVI_ThematicChange inputs.\nMandatory (optional) settings are listed as Required = True (Required = False).\n\n Name | Required | Default | Valid Values | Description \n--------|:----------:|-----------|----------------|---------------\nfile_types|False|N/A|string|GBDX Option. Comma seperated list of permitted file type extensions. Use this to filter input files -- Value Type: STRING`[*]`\ninput_raster1|True|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Specify a classification raster representing the earliest time. -- Value Type: ENVIRASTER\ninput_raster1_format|False|N/A|string|Provide the format of the image, for example: landsat-8. -- Value Type: STRING\ninput_raster1_band_grouping|False|N/A|string|Provide the name of the band grouping to be used in the task, ie - panchromatic. -- Value Type: STRING\ninput_raster1_filename|False|N/A|string|Provide the explicit relative raster filename that ENVI will open. This overrides any file lookup in the task runner. -- Value Type: STRING\nmerge_no_change|False| true|string|If the two input classification images have the same number of classes that use the same class name, set to true to group them into a class named no change if there was no difference detected during processing. Set to false if the output is a new classification image that includes all class transition information. -- Value Type: BOOLEAN -- Default Value: true\ninput_raster2|True|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Specify a classification raster representing the latest time. -- Value Type: ENVIRASTER\ninput_raster2_format|False|N/A|string|Provide the format of the image, for example: landsat-8. -- Value Type: STRING\ninput_raster2_band_grouping|False|N/A|string|Provide the name of the band grouping to be used in the task, ie - panchromatic. -- Value Type: STRING\ninput_raster2_filename|False|N/A|string|Provide the explicit relative raster filename that ENVI will open. This overrides any file lookup in the task runner. -- Value Type: STRING\noutput_raster_uri_filename|False|N/A|string|Specify a string with the fully-qualified path and filename for OUTPUT_RASTER. -- Value Type: STRING\n\n\n### Outputs\n\nThe following table lists all ENVI_ThematicChange outputs.\nMandatory (optional) settings are listed as Required = True (Required = False).\n\n Name | Required | Default | Valid Values | Description\n--------|:----------:|-----------|----------------|---------------\ntask_meta_data|False|N/A|directory|GBDX Option. Output location for task meta data such as execution log and output JSON\noutput_raster_uri|True|N/A|directory|Output for OUTPUT_RASTER. -- Value Type: ENVIURI\n\n\n**Output structure**\n\nThe output_raster_uri file will be written to the specified S3 Customer Account Location.\n\n### Background\nFor additional background information on this task please refer to the [Harris Geospatial ENVI documentation](http://www.harrisgeospatial.com/docs/home.html) and \n[ENVI® Thematic Change](http://www.harrisgeospatial.com/docs/envithematicchangetask.html). \n\n### Contact\nIf you have any questions or issues with this task, please contact [gbdx-support:::at:::digitalglobe.com](mailto:gbdx-support@digitalglobe.com).","excerpt":"This task takes two classification images of the same scene taken at different times and identifies differences between them. The resulting classification image shows class transitions, for example, from class 1 to class 2. Thematic change detection can be used to analyze land use, land cover change, deforestation, urbanization, agricultural expansion, water variability, and more.\n \n**GBDX Registered Name:** ENVI_ThematicChange\n\n**Provider:** Harris Geospatial Solutions","slug":"envi-thematic-change","type":"basic","title":"ENVI® Thematic Change"}

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ENVI® Thematic Change

This task takes two classification images of the same scene taken at different times and identifies differences between them. The resulting classification image shows class transitions, for example, from class 1 to class 2. Thematic change detection can be used to analyze land use, land cover change, deforestation, urbanization, agricultural expansion, water variability, and more.
**GBDX Registered Name:** ENVI_ThematicChange
**Provider:** Harris Geospatial Solutions

### Inputs
The following table lists all ENVI_ThematicChange inputs.
Mandatory (optional) settings are listed as Required = True (Required = False).
Name | Required | Default | Valid Values | Description
--------|:----------:|-----------|----------------|---------------
file_types|False|N/A|string|GBDX Option. Comma seperated list of permitted file type extensions. Use this to filter input files -- Value Type: STRING`[*]`
input_raster1|True|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Specify a classification raster representing the earliest time. -- Value Type: ENVIRASTER
input_raster1_format|False|N/A|string|Provide the format of the image, for example: landsat-8. -- Value Type: STRING
input_raster1_band_grouping|False|N/A|string|Provide the name of the band grouping to be used in the task, ie - panchromatic. -- Value Type: STRING
input_raster1_filename|False|N/A|string|Provide the explicit relative raster filename that ENVI will open. This overrides any file lookup in the task runner. -- Value Type: STRING
merge_no_change|False| true|string|If the two input classification images have the same number of classes that use the same class name, set to true to group them into a class named no change if there was no difference detected during processing. Set to false if the output is a new classification image that includes all class transition information. -- Value Type: BOOLEAN -- Default Value: true
input_raster2|True|N/A|[See ENVIRASTER input type](https://gbdxdocs.digitalglobe.com/docs/envi-task-engine#section-enviraster)|Specify a classification raster representing the latest time. -- Value Type: ENVIRASTER
input_raster2_format|False|N/A|string|Provide the format of the image, for example: landsat-8. -- Value Type: STRING
input_raster2_band_grouping|False|N/A|string|Provide the name of the band grouping to be used in the task, ie - panchromatic. -- Value Type: STRING
input_raster2_filename|False|N/A|string|Provide the explicit relative raster filename that ENVI will open. This overrides any file lookup in the task runner. -- Value Type: STRING
output_raster_uri_filename|False|N/A|string|Specify a string with the fully-qualified path and filename for OUTPUT_RASTER. -- Value Type: STRING
### Outputs
The following table lists all ENVI_ThematicChange outputs.
Mandatory (optional) settings are listed as Required = True (Required = False).
Name | Required | Default | Valid Values | Description
--------|:----------:|-----------|----------------|---------------
task_meta_data|False|N/A|directory|GBDX Option. Output location for task meta data such as execution log and output JSON
output_raster_uri|True|N/A|directory|Output for OUTPUT_RASTER. -- Value Type: ENVIURI
**Output structure**
The output_raster_uri file will be written to the specified S3 Customer Account Location.
### Background
For additional background information on this task please refer to the [Harris Geospatial ENVI documentation](http://www.harrisgeospatial.com/docs/home.html) and
[ENVI® Thematic Change](http://www.harrisgeospatial.com/docs/envithematicchangetask.html).
### Contact
If you have any questions or issues with this task, please contact [gbdx-support@digitalglobe.com](mailto:gbdx-support@digitalglobe.com).